I've heard lots of speakers with 6.5 inch woofers. They can generate the lower frequencies but they always sound small to me. 8 inch is the smallest woofer size that sounds convincing. And both need a sub of 12 or more to move air below 40hz.
I’m using an 8” “sub” in a secondary system. It’s more of a low frequency driver. Makes reasonable thump but a real subwoofer has to be 10 or 12 inches minimum.
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